An efficient multi objective optimization approach for robust tuning of power system stabilizers

摘要

This paper presents the robust tuning of power system stabilizer (PSS) with modified harmony search (MHS) algorithm. The problem of selecting appropriate design parameters of PSS is formulated as an optimization problem with minimization of eigenvalue based multi objective function. This objective function is optimized to alleviate the poorly damped or unstable oscillatory modes of the power system in order to meet the guaranteed stability. The proposed design of PSS under large disturbances includes the Integral of Time Square Error (ITSE) index in the objective function. The performance of proposed modified harmony search based PSS (MHSPSS) and robust modified harmony search based PSS (RMHSPSS) under different operating conditions and disturbances are investigated for Single Machine Infinite Bus (SMIB) system. The effectiveness of the approach is demonstrated with eigenvalue analysis and nonlinear time domain simulations for the given system.